neb vs olfactory organ

neb and olfactory organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
neb	Yes	No	No	No
olfactory organ	Yes	No	No	No

As nouns, olfactory organ is a hypernym of neb; that is, olfactory organ is a word with a broader meaning than neb:

neb: a long projecting or anterior elongation of an animal's head; especially the nose
olfactory organ: the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals

Other hypernyms of neb include nose.

neb (noun)	olfactory organ (noun)
horny projecting mouth of a bird	the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals
a long projecting or anterior elongation of an animal's head; especially the nose