Cautious is an adjective, so it does not have a possessive form.
The noun form of cautious is caution, so the possessive noun would be caution's. It is an abstract noun, so it would be difficult to find an appropriate way to use it, but a suggestion would be "With caution's hindsight, the children learnt to cross the street only after looking both ways carefully."
The possessive singular noun is explorer's. The possessive plural noun is explorers'.
The possessive form for the noun coyote is coyote's.
The possessive form of zoo is zoo's.
The possessive form for the noun preacher is preacher's.
The possessive form for the noun laboratory is laboratory's.
No, he is not possessive. The possessive form would be his.
The possessive form for the noun oxygen is oxygen's.
The possessive form is grandson's.
The possessive form is island's.
The possessive form for the noun coyote is coyote's.
The word "cautious" is not a noun; it's an adjective, a word used to describe a noun.The noun form of the adjective "cautious" is cautiousness.The word "cautious" is the adjective form of the noun caution.
The possessive noun of Sam is Sam's.