platelet vs living substance

platelet and living substance both are nouns.

Word	Noun	Adjective	Verb	Adverb
platelet	Yes	No	No	No
living substance	Yes	No	No	No

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

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

Other hypernyms of platelet include protoplasm.

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