What's the meaning of homonym, acronym, pseudonym?

[GlummyGuy]

English Language Tests, Intermediate level

ESL/EFL Test #93 "Hotchpotch", question 7

He didn't reveal his name with his first book and published it under a ..........

(a) synonym
(b) homonym
(c) acronym
(d) pseudonym

English Language Tests, Intermediate level

ESL/EFL Test #93 "Hotchpotch", answer 7

He didn't reveal his name with his first book and published it under a pseudonym.

Correct answer: (d) pseudonym
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I want to know the meaning of homonym, acronym, pseudonym.

[Mister Micawber]

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Look HERE.
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Native English teacher at Mister Micawber's