welcomer vs actor

welcomer and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
welcomer	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of welcomer; that is, actor is a word with a broader meaning than welcomer:

Other hypernyms of welcomer include doer, worker.

welcomer (noun)	actor (noun)
a person who greets	a theatrical performer
	a person who acts and gets things done