This is the 5821st most frequent Japanese word.
ひこ
The Japanese word "ひこ" (hiko) is an archaic term meaning "boy" or "prince" and is often used in names.
The word 'ひこ' is part of '飛行機' (ひこうき) which means airplane. '飛行' (ひこう) represents flight performance and '機' (き) refers to machine. Combined, it denotes an airplane.
飛行機が空を飛んでいます。
The airplane is flying in the sky.
'ひこ' here directly refers to '飛行' (ひこう), meaning the act of flying. In this context, it highlights someone's flying speed.
彼のひこはとても早い。
His flight is very fast.
'ひこ' once again represents '飛行' (ひこう), referring to the act of flying a kite. It is used as a noun to describe the activity.