needle-shaped vs acicular

needle-shaped and acicular both are adjectives.

Word	Noun	Adjective	Verb	Adverb
needle-shaped	No	Yes	No	No
acicular	No	Yes	No	No

As adjectives, needle-shaped and acicular are synonyms defined as:

Other synonyms of needle-shaped include acerate, acerose.

needle-shaped (adjective)	acicular (adjective)
narrow and long and pointed; as pine leaves	narrow and long and pointed; as pine leaves