stereotype vs pigeonhole

stereotype and pigeonhole both are nouns.

Word	Noun	Adjective	Verb	Adverb
stereotype	Yes	No	Yes	No
pigeonhole	Yes	No	Yes	No

As verbs, stereotype and pigeonhole are synonyms defined as:

stereotype and pigeonhole: treat or classify according to a mental stereotype

Other synonyms of stereotype include stamp.

stereotype (noun)	pigeonhole (noun)
a conventional or formulaic conception or image	a small compartment
	a specific (often simplistic) category

stereotype (verb)	pigeonhole (verb)
treat or classify according to a mental stereotype	treat or classify according to a mental stereotype
	place into a small compartment