Ambition is an improper (common) noun, since it is the name of something general. It is not a proper noun since it is not a title of something.
For example; "city" is an improper noun since it is general, but "London" is a proper noun since it is the title of a specific city.
The word ambitious is an adjective. It describes someone who possesses ambition.
what part of speech is work
adverb
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"Qualified" is an adjective. And so is the word "ambitious". Both words modify the noun "graduates", which is what an adjective does.
"As he was valiant I honour him but as he was ambitious I slew him."
"You all did see upon the Lupercal, I thrice presented him a kingly crown, which he did thrice refuse. Did this in Caesar seem ambitious?"
part of speech
The part of speech for this particular word is a noun.
adverb
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Sashay is a verb. It means to walk in an exaggerated, showy manner, often with hip swaying.
"Did not" or "didn't" is a contraction of the auxiliary verb "did" and the adverb "not," forming a negative past tense construction in English.
Adjective
The word speech is a noun.