platelet vs blood platelet

platelet and blood platelet both are nouns.

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

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

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

Other synonyms of platelet include thrombocyte.

platelet (noun)	blood 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