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насекомое

True

But it is extremely easy to make adjectives out of a noun :)

Not completely true
Прошлое лето for instance

it could be an adjective..

--Ростовчанин

Almost.
Видела ли Аня Машу?

Thats a question, that simply asks has Ann seen Maria :)
but without the "ли" you can't really say Видела Аня Машу.
I mean, you can.. You *will* be understood just...