What part of speech is early in "I had my lunch early"?
Is it an adjective or an adverb?
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The word early can certainly be used as an adverb of time (See Adverbs of Time list)
If it feels strange to you to call it an adverb, just try replacing it with a more "familiar" adverb
I had my lunch quickly.
It's an indication of how the verb had was carried out.