fetus vs foetus

fetus and foetus both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetus	Yes	No	No	No
foetus	Yes	No	No	No

As nouns, fetus and foetus are synonyms defined as:

fetus and foetus: an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal

fetus (noun)	foetus (noun)
an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal	an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal