Do I need to know all possible meanings of a word?

[hasibul212003]

Hi I was studying the 500 essential words from the Manhattan book vol 8 and saw that some words have been only used as an adjective but the word could be also used a verb and a noun. One word would be keen-the book has the adjective but the noun and verb which means lament and lamentation respectively have been omitted. Sud I just study the adjective for the word or sud I look into the verb and noun for it as well. Is this the case for all words listed in the set.
Thanks.

[tommywallach]

Hey Hasi,

Yep. You should know all meanings. Any of them can be tested.

-t