보

Protection

보안 = the preservation of public peace
보호 = protection
보험 = insurance
보관(하다) = custody, have a thing in one´s keeping
담보 = security, mortgage
보건소 = public health center
아동 보호 = child protection

Report

예보 = forecasting

일기예보 = weather forecast

경보 = alarm, warning
정보 = information
보고(하다) = report

보고서 = written report, paper

보도(하다) = report, notify

홍보(하다) = public relations
속보 = newsflash

Fill

보충(하다) = supplement
보강(하다) = reinforcement
후보 = candidate, candidacy
보조(하다) = assistance, support, assist

보정(하다) = revision

양보(하다) = make a concession

Step

보행기 = baby walker
초보/초보자 = beginner
도보 = going on foot
횡단보도 = crosswalk

약

Weak

강약 = strength and weakness
약점 = weak point (점 = point)
약(하다) = to be weak
노약자 = old and weak people (giving up your seat for people on public transport (노약자석 = seat for old and weak people))

Contract

약속(하다) = promise, appointment (속 = bind)
약혼(하다) = mariage engagement (약혼자/약혼녀 = fiancé (male/female))
계약 = contract
예약(하다) = make a reservation (예 = before)
요약(하다) = summarize, summary

Medicine

약 = medicine
약국 = pharmacy
약사 = pharmacist
약대/약학대학 = college of pharmacology
마약 = Drug
독약 = Poison, poisonous drug

예

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)