dig, excavate
掘る(ほる)、発掘(はっくつ)
to dig, excavation
On-reading (クツ) is used in compounds; kun-reading (ほ(る)) is used standalone or with okurigana. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.
From the JLP Quiz question bank — the word in the form it is actually tested in.
( )に入る最も適切なものを選べ。発掘された遺物を( )するために、専門家チームが招集された。
Answer: 同定