blood platelet vs protoplasm

blood platelet and protoplasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood platelet	Yes	No	No	No
protoplasm	Yes	No	No	No

As nouns, protoplasm is a hypernym of blood platelet; that is, protoplasm is a word with a broader meaning than blood platelet:

blood platelet: tiny bits of protoplasm found in vertebrate blood; essential for blood clotting
protoplasm: the substance of a living cell (including cytoplasm and nucleus)

Other hypernyms of blood platelet include living substance.

blood platelet (noun)	protoplasm (noun)
tiny bits of protoplasm found in vertebrate blood; essential for blood clotting	the substance of a living cell (including cytoplasm and nucleus)