ham sandwich vs sandwich

ham sandwich and sandwich both are nouns.

Word	Noun	Adjective	Verb	Adverb
ham sandwich	Yes	No	No	No
sandwich	Yes	No	Yes	No

As nouns, sandwich is a hypernym of ham sandwich; that is, sandwich is a word with a broader meaning than ham sandwich:

ham sandwich (noun)	sandwich (noun)
a sandwich made with a filling of sliced ham	two (or more) slices of bread with a filling between them

ham sandwich (verb)	sandwich (verb)
	insert or squeeze tightly between two people or objects
	make into a sandwich