gagman vs gagster

gagman and gagster both are nouns.

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

As nouns, gagman and gagster are synonyms defined as:

gagman and gagster: someone who writes comic material for public performers

Other synonyms of gagman include gagwriter.

gagman (noun)	gagster (noun)
someone who writes comic material for public performers	someone who writes comic material for public performers
a comedian who uses gags