No, mainly is an adverb. It is the adverb form of the adjective main and means primarily.
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It is mainly a noun, but can be used as an adjective. Autumn is a beautiful time of year -- noun. I love autumn leaves -- adjective.
The word "fly" is mainly used as a verb. However, it can be used as an adjective. It is used to mean quick-witted or well-dressed in slang terms.
The correct spelling of the adjective is leery (wary, or concerned).The proper name, a surname, is often spelled Leary(mainly from O'Leary).
The adjective form is "correctional" (of or about correction). It is mainly used as a euphemism in prison systems. Another related adjective, corrective, means used to correct.
The word is usually one word "preseason" (as in sports). However, one adjective form, used mainly for clothing, is often seen as pre-seasonal.