gộc
noun

stock (trunk or woody stem of a tree)

adj

(colloquial) stocky; big; huge

gội
verb

to wash one's hair

gộp
verb

to add up; to total up

合
character

chữ Hán form of hợp (“to unite, suitable”).
chữ Hán form of hiệp (“unite”).
Nôm form of sáp (“flexible material used to store cosmetics”).