pen-tail vs pen-tailed tree shrew

pen-tail and pen-tailed tree shrew both are nouns.

Word	Noun	Adjective	Verb	Adverb
pen-tail	Yes	No	No	No
pen-tailed tree shrew	Yes	No	No	No

As nouns, pen-tail and pen-tailed tree shrew are synonyms defined as:

pen-tail and pen-tailed tree shrew: brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia

Other synonyms of pen-tail include pentail.

pen-tail (noun)	pen-tailed tree shrew (noun)
brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia	brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia