words vs spat

words and spat both are nouns.

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

As nouns, spat is a hyponym of words; that is, spat is a word with a more specific, narrower meaning than words:

Other hyponyms of words include affray, altercation, fracas, bicker, bickering, fuss, pettifoggery, squabble, tiff, bust-up.

words (noun)	spat (noun)
words making up the dialogue of a play	a young oyster or other bivalve
an angry dispute	a cloth covering (a legging) that covers the instep and ankles
the text of a popular song or musical-comedy number	a quarrel about petty points
the words that are spoken
language that is spoken or written

words (verb)	spat (verb)
	clap one's hands together
	spawn
	engage in a brief and petty quarrel
	clap one's hands or shout after performances to indicate approval
	strike with a sound like that of falling rain
	become permanently attached
	come down like raindrops