spiculum vs spicule

spiculum and spicule both are nouns.

Word	Noun	Adjective	Verb	Adverb
spiculum	Yes	No	No	No
spicule	Yes	No	No	No

As nouns, spiculum and spicule are synonyms defined as:

spiculum and spicule: small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals

spiculum (noun)	spicule (noun)
small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals	small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals