No, absent is an adjective. The adverb form is "absently" (which has other connotations).
No. It is a noun. There is an adverb form of the adjective absent, which is absently, but it has an entirely different connotation (inattentively, in a preoccupied or peripheral manner).
He absently stared at a wall with his eyes half-open.
absently
not pleasant
The noun absence has the verb and adjective form absent. The related adverb form is absently, which, however, has a connotation beyond simple absence: it suggests inattentiveness, absent-mindedness.
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Absenting and absented are two suffixes.
Detergent rhymes with urgent.
When taking attendance in her morning class, Mrs. Koi noted Suzanne was absent today.
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
No, it is not an adjective. Differently is an adverb.The adjective would be different.