luỹ
noun

a rampart; embankment
a row of trees planted like a fence (especially bamboo)

flood
(somewhat derogatory) a bunch (of individuals)

lũ lụt
noun

flood (generally speaking)

lũ quét
noun

flash flood

lũ ống
noun

deluge

lũng đoạn

lũng đoạn
verb

to corner the market, to monopolize

屨
character

straw sandals
tread on

縷
character

silk thread (see lụa)
silky (see lụa)

𫃵
character

silk thread (see lụa)
silky (see lụa)