shell parakeet vs parakeet

shell parakeet and parakeet both are nouns.

Word	Noun	Adjective	Verb	Adverb
shell parakeet	Yes	No	No	No
parakeet	Yes	No	No	No

As nouns, parakeet is a hypernym of shell parakeet; that is, parakeet is a word with a broader meaning than shell parakeet:

shell parakeet: small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors
parakeet: any of numerous small slender long-tailed parrots

Other hypernyms of shell parakeet include paraquet, paroquet, parrakeet, parroket, parroquet.

shell parakeet (noun)	parakeet (noun)
small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors	any of numerous small slender long-tailed parrots