What are some words with -gen suffix - PREFIXES AND SUFFIXES

The word image is an unbound morpheme, not a bound morpheme, because it is a word by itself. In any language,a morpheme is a unit of meaning. A word is an unbound morpheme because it is a unit of meaning when it stands alone, not bound to anything else. Image is a morpheme in "imagination," but, because image is a word in itself, image is an unbound morpheme, rather than a bound morpheme.
Thanks to Charles Cairns in comments, I have some example of bound morphemes.
Any prefix or suffix that is not a word in itself is a bound morpheme. That would include terms like infra (used in infrastructure and infrared, but not a word in itself). Also suffixes, like -s and -es to make a word plural. I asked Charles for some word roots that were bound morphemes, and he suggested pant- as in pants and scissor- as in scissors.
Original example, questioned by linguist Charles Cairns in comments.
In contrast, in English, -struct- is a bound morpheme. It is not a word in itself. Yet it can be a suffix, as in instruct, or a prefix, as in structure. Or it can be a root, as in destructive. A unit of meaning that is not a word in itself, but is any or all of these: prefix, suffix, infix, or root is a bound morpheme.
Charles challenged this because most or all the words that contain -struct- are from the Latin, so it may be that it is a Latin root, but, as new words are not developing in English, not a bound morpheme in English. As he is the expert, I bow to his knowledge. At the same time, I wonder about words like reconstruction, deconstruction, and infrastructure. As I suspect some of these words were created in English, one might make a case for -struct- being a bound morpheme with more and more prefixes and suffixes being added on.
For more, see Bound and unbound morphemes - Wikipedia.

tion is not a word so it doesnt have a suffix

due you mean suffix of words ending in ........tion? like education (al)

Prefixes and suffixes are grammatical and lingual "affixes." Prefixes are affixed before and suffixes after a base word or word stem to add information. For example, with the word "prehistoric," the prefix is "pre-" meaning "before," the base word is "history" meaning "recorded events and knowledge", and the suffix is "-ic" meaning "relating to the science of."
In other words, "prefix" simply refers to an attachment before or in front of, in this case, a shorter word or stem. In lingual terms, a "stem" is the main part of a word to which prefixes and suffixes can be added and may not necessarily be a word itself, such as "dod" in "doddle."
Similarly, "suffix" refers to an attachment after the end of an existing word or stem, serving to form a new word or functioning as an inflectional ending, for example, "s" or "es" to make for plurality.

"BELL" has no prefix because you didn't write one.

Some words can have several prefixes or suffixes. There is no answer to your question since you wrote a word without a prefix. It would be the same as asking what is the prefix of "manufacture" as this word has no prefix; however, if you asked what the prefix of the word "remanufacture" is, one could answer that the prefix is "re". If you asked what the prefix and suffix are of the word "re-manufacturable" I would answer with Prefix = re, Suffix = able.

No prefix nor suffix in this simple word.

Compose does not have a suffix. It may be considered to have a prefix, which would be "com-". Com- as a prefix usually means "together."

Does not have a suffix. Not all words have prefixes and suffixes!

Segregation
Segregate
"se" is the prefix meaning: "from" or "away"
"greg" is the root of the word meaning "group" or "united" or "union"
"tion" is the suffix meaning "result of" or "state of" or "act of"
"ate" (for segregate) would be the suffix meaning: "make" or "cause".
Hope this helped!

noun derivative - a verb that becomes a noun by adding a suffix.

You sometimes come across words which have been derived from their roots by adding certain structures like prefixes and suffixes.


You sometimes come across words which have been derived from their roots by adding certain structures like prefixes and suffixes.
In your earlier years of schooling, you must have been done with exercises and development activities on the use of prefixes
A prefix- is a group of letters added before a word or base to alter its meaning and form a new word. In contrast, a suffix is a group of letters added after a word or base.
5 Example of prefixes:
Prefixes MEANING EXAMPLES
ana- up, back, again analogy, anatomy, anagram
anti- against antipathy, antiwar, antisocial
apo- from, away from apology, apologize
com- with, together communal, community
con- with, together connect, confide conspire
there are so many example of this. i hope it helps. remember that an adjective derivative is a noun, verb and adjective that becomes an adjective by means of adding affixes.
In this lesson, you will deal with deriving words through the use of suffixes.
A suffix added to the end of a root word.
5 Example of suffixes:
Suffixes Meaning Example
-ics things having to do with optics, physics
-ism the belief in pacifism, terrorism, socialism, communism
-logy study field of biology, geology, etymology, cardiology
-or, -er one who takes part in doctor, actor, teacher, driver
-sis act, state, condition of analysis
We have, for example, a verb that becomes a noun by adding a suffix.
This is called a noun derivative
A noun that becomes an adjective by adding a suffix is called an adjective derivative
Example of Adjective Derivative:
subject- subjective
addict- addictive
react- reactive
success- successive
care- careless
ugly- ugliness
hope- hopeless
steel- steely
accept- acceptable
obey - obedient
there are so many example of this. i hope it helps. remember that an adjective derivative is a noun, verb and adjective that becomes an adjective by means of adding affixes.
These are but few ways by which we can identify how words are derived.