myofibril vs myofibrilla

myofibril and myofibrilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
myofibril	Yes	No	No	No
myofibrilla	Yes	No	No	No

As nouns, myofibril and myofibrilla are synonyms defined as:

myofibril and myofibrilla: one of many contractile filaments that make up a striated muscle fiber

Other synonyms of myofibril include sarcostyle.

myofibril (noun)	myofibrilla (noun)
one of many contractile filaments that make up a striated muscle fiber	one of many contractile filaments that make up a striated muscle fiber