This is the 4539th most frequent Japanese word.
巨人
"巨人" means "giant" or "titan" in English.
Here, 巨人 is the name of a baseball team, referring to a proper noun.
彼は野球チーム、巨人のファンです。
He is a fan of the baseball team Giants.
In this context, 巨人 is used metaphorically, comparing accomplishment to the grand stature of giants.
彼の功績は巨人のように偉大だ。
His achievements are as great as those of a giant.
In this sentence, 巨人 refers to literal giants, mythical beings of enormous size.