blood platelet vs platelet

blood platelet and platelet both are nouns.

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

As nouns, blood platelet and platelet are synonyms defined as:

blood platelet and platelet: tiny bits of protoplasm found in vertebrate blood; essential for blood clotting

Other synonyms of blood platelet include thrombocyte.

blood platelet (noun)	platelet (noun)
tiny bits of protoplasm found in vertebrate blood; essential for blood clotting	tiny bits of protoplasm found in vertebrate blood; essential for blood clotting