tree shrew vs pentail

tree shrew and pentail both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree shrew	Yes	No	No	No
pentail	Yes	No	No	No

As nouns, pentail is a hyponym of tree shrew; that is, pentail is a word with a more specific, narrower meaning than tree shrew:

tree shrew: insectivorous arboreal mammal of southeast Asia that resembles a squirrel with large eyes and long sharp snout
pentail: brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia

Other hyponyms of tree shrew include pen-tail, pen-tailed tree shrew.

tree shrew (noun)	pentail (noun)
insectivorous arboreal mammal of southeast Asia that resembles a squirrel with large eyes and long sharp snout	brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia