This is the 10163rd most frequent Japanese word.
釘
"釘" means "nail" (as in a metal nail used in construction).
In this sentence, "釘" (kugi) means "nails" as tools used in construction.
大工は釘を使って木を固定します。
The carpenter uses nails to secure the wood.
Here, "釘" refers to a nail used as an engraving tool.
彼は机に釘で名前を彫った。
He engraved his name on the desk using a nail.
In this context, "釘" indicates the nails embedded in the wall.