How to find a given word is wheter noun/verb/adverb/adjective?

[Vara]

English Language Tests, Intermediate level

ESL/EFL Test #215 "Antonyms (1)", question 5

Environmentalists around the world fight to preserve the world's natural beauty and resources for future generations. What is an antonym of 'preserve'? .........

(a) destroy
(b) protect
(c) conserve
(d) consider

English Language Tests, Intermediate level

ESL/EFL Test #215 "Antonyms (1)", answer 5

Environmentalists around the world fight to preserve the world's natural beauty and resources for future generations. What is an antonym of 'preserve'? destroy

Correct answer: (a) destroy

Your answer was: correct
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can you please help me how to find a given word is wheter noun/verb/adverb/adjective, i allways get confused here while finding these?

[Mister Micawber]

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Some have characteristic suffixes (-ly is usually an adverb, -ion is usually a noun, -ize is usually a verb, etc), but the safest path is to use your dictionary.
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Native English teacher at Mister Micawber's