How about if you wrote a sentence or at least a noun phrase where you need to use these as adjectives and see if you can come up with some of these yourself? I am having a hard time thinking of how you use "sea" or "sky" as an adjective.
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AnonymousadjectiveThere may be several in some cases.
Adjective form of "salt" is simply "salty"
Adjective form of "blood" is simply "******"
Adjective form of "woman" is simply "womanly"
Adjective form of "boy" is simply "boyish"
Adjective form of "sky" is "skyey"
"Sea" may not have one.