Line, wire

선 = line
유선 = wire, cable
무선 = Wireless
직선 = straight line
곡선 = curve
안전선 = safety line (subway)
1호선 = line no.1 (subway)

First, ahead

선생(님) = teacher
선불 = advanced payment (후불 = post payment)
선배 = one’s senior (school, company, etc.)
선임 =  one’s senior (army, company, etc.)
선착순 = first-come-first-served basis

Selection

선거(하다) = election, vote
선택(하다) = selection, choice
선수 = player, athlete

Before 

예약(하다) = reservation
예정(이다) = prearrange, plan
예상(하다) = expect, anticipate
예방(하다) = prevent
예매(하다) = buy (tickets) in advance
예열(하다) = preheat
예산 = budget
예고 = movie trailer
일기예보 = weather forecast
예방접종 = vaccination
예전 = the old days, a long time ago
옛날 = the old days 

Etiquette (also 례)

예절 = propriety, etiquette, manners
예의 = manners, etiquette
무례(하다) = impolite, rude (무 = without)
실례(하다) = rude (실 = loss)

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Eat 

음식 = food
식사 = meal
식비 = food expenses
식탁 = dinner table
간식 = snack (small meal)
야식 = midnight snack
식욕 = appetite, desire to eat
금식(하다) = to fast

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Ceremony

결혼식 = wedding ceremony
약혼식 = engagement ceremony
입학식 = (school) entrance ceremony
졸업식 = graduation ceremony
시상식 = ceremony of awarding prizes
장례식 = funeral ceremony

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Method, way

방식 = form, method
신식 = modern, a new style, a new method
구식 = old style, old method
공식 = formal, official
비공식 = unofficial

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Knowledge 

상식 = common sense
무식(하다) = ignorant
유식(하다) = intelligent
박식(하다) = wide(extensive) knowledge 

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Is not, does not exist

무교 = no religion
무선 = wireless
무료 = free, no charge
무례(하다) = impolite, rude
연중무휴 = open throughout the year (store)
무능력(하다), 무능(하다) = incompetent (no ability)
무식(하다) = ignorant
무관심(하다) = unconcerned, have no interest in
무중력 = zero gravity
무한 = infinity (한 = end, limit)
무조건(하다) = unconditional (조건 = condition)

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Work

공무원 = someone who works for the government
근무(하다) = service, work
업무 = business
의무 = duty
사무실 = office room
교무실 = teacher´s room

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Be, exist

부유(하다) = wealthy
유명하다 = famous, well-known
유리(하다) = advantage, Profitable
유무 = existence/non-existence
유식(하다) = intelligent (식 = knowledge, 무식(하다) = ignorant)

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Young child, infant

유아기 = early childhood
유치원 = kindergarten
유치하다 = childish
유충 = larva

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Leave behind 

유전(되다) =  to be hereditary
유산 = inheritance
유언 = one´s dying wish, one´s last words

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Stay

유학(하다/가다) = study abroad
유학생 = student studying abroad
유급(하다) = stay back in the class
유급생  = student remaining in the same class