Hi, Hoa. Well, this is a ① !
There are so many words in English ② similar meanings, which I know can ③ .
In the examples you give, ④ do have very similar meanings, but usual has a ⑤ .
I think it's useful here to talk about ⑥ , which means words that are often used together.
And when you're studying English vocabulary, ⑦ some time just studying collocation.
You can do this by ⑧ good quality monolingual (English-English) dictionary, which explains collocation.
You can also study collocation by reading texts ( ⑨ ) in English
and looking carefully at the ⑩ , and verbs and their objects.
And it's also possible to purchase specialist vocabulary books and collocation dictionaries.
① good question
② that have
③ be confusing for learners
④ normal and ordinary
⑤ slightly different meaning
⑥ vocabulary collocation
⑦ it's worth spending
⑧ looking at a
⑨ fiction or non-fiction
⑩ combinations of adjectives and nouns