-und = in flow with water

abound

ab- = off, away from + o + und = rise in a wave

aboundance

aboundantly

inundate

in + und + ate

shingle

shin = thin

us-, ut- = use, 使用

use

used

user

useful

useless

useable

land-use

unused

usefulness

reusable

usual

usually

unusual

unusually

abuse

abusive

abuser

usurp

utensil

utilize

utility

utilization

brook

uni- = one, unique

unify

vt.

unifying

adj.

unified

adj.

unification

n.

reunification

n.

unilateral

adj.

unilaterally

adv.

union

n.

reunion

n.

unionized

adj.

unique

adj.

uniquely

adv.

uniqueness

n.

unit

n.

unite

v.vt

united

adj.

unitary

adj.

reunite

vt.

unity

n.

unanimous

adj. un=uni + anim=mind,spirit + ous

unicorn

n.