collator vs tabulator

collator and tabulator both are nouns.

Word	Noun	Adjective	Verb	Adverb
collator	Yes	No	No	No
tabulator	Yes	No	No	No

As nouns, tabulator is a hypernym of collator; that is, tabulator is a word with a broader meaning than collator:

collator: a machine that selects, merges and matches decks of punch cards.
tabulator: an electromechanical machine designed to assist in summarizing information and, later, accounting.

Other hypernyms of collator include sorter, tabulating machine.

collator (noun)	tabulator (noun)
a machine that selects, merges and matches decks of punch cards.	a calculator that keeps a record of the number of times something happens
	an electromechanical machine designed to assist in summarizing information and, later, accounting.