請問點樣先可以知道果個英文字既真正意思?

首先你要判斷你篇野果個字係verb, adj, noun, adv 定乜野

然後, 睇下你篇野個上文下理係講乜, 搵意思最接近果個

這純粹要看這整句的意思, 正如你說同樣的字有不同解釋, 亦有noun/verb之分.
例如: Point
Noun - 要點, 含意 - I didn't see the point of his last remark.
Verb - 指向, 瞄準 - She pointed at the house & said that's where she lives.

要看前文後理。