gagman vs writer

gagman and writer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gagman	Yes	No	No	No
writer	Yes	No	No	No

As nouns, writer is a hypernym of gagman; that is, writer is a word with a broader meaning than gagman:

gagman: someone who writes comic material for public performers
writer: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of gagman include author.

gagman (noun)	writer (noun)
someone who writes comic material for public performers	writes (books or stories or articles or the like) professionally (for pay)
a comedian who uses gags	a person who is able to write and has written something