The singular possessive noun for the mouth of a fish is fish's mouth.
"Firefly's" is a singular possessive noun.
The singular possessive noun is stepchild's.
No, "tomb" is a singular common noun, not a possessive noun.
The singular noun is tooth.The singular possessive noun is tooth's.
The singular possessive form for the noun clock is clock's.
The possessive form of the singular noun mink is mink's.example: A mink's diet consists of birds, small animals, and fish.
The noun vest is the singular form.The noun vest's is the singular possessive form.
No, "she's" stands for she is. The singular possessive noun for a female is her or hers.
The singular possessive noun of grandmother is grandmother's.
The spelling 'fishs' is an incorrect form.The correct plural form is fishes. The plural possessive form is fishes'.example: The sunlight sparkled off the fishes' backs.Note: To all who want to edit this answer based on the fact that the noun 'fish' is an uncountable noun, please be advised that the noun 'fish' is an uncountable noun as a word for a food substance; the plural form 'fishes' is a correct plural form for live fish, caught fish, or types of fish.
The singular possessive noun for nature is "nature's."
The singular possessive noun for lioness is lioness' or lioness's, whichever you think sounds better.