wpm vs words per minute

wpm and words per minute both are nouns.

Word	Noun	Adjective	Verb	Adverb
wpm	Yes	No	No	No
words per minute	Yes	No	No	No

As nouns, wpm and words per minute are synonyms defined as:

wpm and words per minute: the rate at which words are produced (as in speaking or typing)

wpm (noun)	words per minute (noun)
the rate at which words are produced (as in speaking or typing)	the rate at which words are produced (as in speaking or typing)