humorist vs punster

humorist and punster both are nouns.

Word	Noun	Adjective	Verb	Adverb
humorist	Yes	No	No	No
punster	Yes	No	No	No

As nouns, punster is a hyponym of humorist; that is, punster is a word with a more specific, narrower meaning than humorist:

Other hyponyms of humorist include lampooner, parodist, ironist, ridiculer, satirist, card, wag, wit.

humorist (noun)	punster (noun)
someone who acts, speaks or writes in an amusing way	someone overly fond of making puns