platter vs LP

platter and LP both are nouns.

Word	Noun	Adjective	Verb	Adverb
platter	Yes	No	No	No
LP	Yes	No	No	No

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

platter: sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove
LP: a long-playing phonograph record; designed to be played at 33.3 rpm

Other hyponyms of platter include L-P, 78, seventy-eight.

platter (noun)	LP (noun)
a large shallow dish used for serving food	a long-playing phonograph record; designed to be played at 33.3 rpm
sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove