words vs difference

words and difference both are nouns.

Word	Noun	Adjective	Verb	Adverb
words	Yes	No	No	No
difference	Yes	No	No	No

As nouns, difference is a hypernym of words; that is, difference is a word with a broader meaning than words:

Other hypernyms of words include conflict, difference of opinion, dispute.

words (noun)	difference (noun)
words making up the dialogue of a play	the quality of being unlike or dissimilar
an angry dispute	a disagreement or argument about something important
the text of a popular song or musical-comedy number	a variation that deviates from the standard or norm
the words that are spoken	the number that remains after subtraction; the number that when added to the subtrahend gives the minuend
language that is spoken or written	a significant change