chemoreceptor vs receptor

chemoreceptor and receptor both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemoreceptor	Yes	No	No	No
receptor	Yes	No	No	No

As nouns, receptor is a hypernym of chemoreceptor; that is, receptor is a word with a broader meaning than chemoreceptor:

chemoreceptor: a sensory receptor that responds to chemical stimuli
receptor: an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation

Other hypernyms of chemoreceptor include sense organ, sensory receptor.

chemoreceptor (noun)	receptor (noun)
a sensory receptor that responds to chemical stimuli	an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
	a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response