Yes, the plural is 'fawns'
Yes, the word "labor" can be pluralized as "labors" to refer to multiple instances of work or toil.
The plural of alumnus is alumni.
The mother deer taught her fawn how to survive in the forrest.
I believe that the pluralized version of the word gulf is just gulfs.
dawn
faun
fawn
Yes, it can be challenged if the word is actually invalid.
Examples of hyphenated compound nouns where the first word is pluralized include "five-star hotels," "six-pack abs," and "ten-dollar bills."
No, "fawn" is not a proper noun. It is a common noun that refers to a young deer.
The fawn followed its mother through the deep, evergreen forest. First, you have to think of a sentence using the word fawn.
'Bellissima' pluralized in Italian is 'bellissime.'