How do you know what word to write in its kanji correspondence?

Question

My study book writes some words like あまり and おおぜい in pure hiragana and I can't figure out whether it is common to write these words in hiragana as the books says, or I'd better write them in their kanji correspondences that I see in a dictionary. For example, I know that I can write うるさい as either 煩い or 五月蝿い but I also know that to write うるさい in kanji in the first place is not a common practice. So I have no problem with うるさい but not with those new words above and more words to come.

What I usually do is to type the word in google, wait for the search bar to drop suggestions and see if the word is in hiragana or kanji. But this definitely has a limit (since most of the time suggestions show both uses) and I can't just make a new post every time I see a new word to ask which one to use.

Is there any good way to know how a word is commonly written?

Answer 1

Google searches for this are pretty useful. There are sites like Jisho.org (http://beta.jisho.org/) that can tell you if something is usually written in kana. It also gives you alternative kanji forms.

I don't know too many specifics, but the suggestions given by Google or Microsoft Word usually suffice. Please correct my errors though.

Here's a good link: When should I replace kanji with hiragana?