20 Old HSK word(s): ☊非常 ** A ☊经常 ** A ☊常 ** A ☊常常 ** A ☊日常 ** B ☊平常 ** B ☊正常 ** B ☊照常 ** B ☊异常 ** B ☊时常 ** C ☊常识 ** C ☊通常 ** C ☊家常 ** D ☊常规 ** D ☊常见 ** D ☊常年 ** D ☊常务 ** D ☊往常 ** D ☊常用 ** D ☊反常 ** D
变换无常* * 反复/覆无常* * 惯常* * 话家常* * 拉家常* * 失常* * 无常* * 喜怒无常* * 习以为常* * 寻常* * 异乎寻常* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

异 different, unusual, strange
乎 interrogative or exclamatory final particle
寻 seek, search, look for / ancient
常 common, normal, frequent, regular
Hsk Characters: 常 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
常 5E38 + 常 + + common, normal, frequent, regular 巾 常 Cloth 常 (OFT) chang2 +

Korean:

常 + 常 항상 상 always
16 NHSK word(s): 非常* 2 fei1 chang2unusual/ extraordinary/ extreme/ very/ exceptional 经常* 3 jing1 chang2day to day/ everyday/ daily/ frequently/ constantly/ regularly/ often 正常* 4 zheng4 chang2regular/ normal/ ordinary 日常* 5 ri4 chang2daily/ everyday 照常* 5 zhao4 chang2(business etc) as usual 通常* 5 tong1 chang2regular/ usual/ ordinary/ normal 常识* 5 chang2 shi2common sense/ general knowledge/ CL:門|门[men2] 平常* 5 ping2 chang2ordinary/ common/ usually/ ordinarily 知足常乐* 6 zhi1 zu2 chang2 le4satisfied with what one has (idiom) 往常* 6 wang3 chang2habitually in the past/ as one used to do formerly/ as it used to be 常年* 6 chang2 nian2a whole year/ average year 常务* 6 chang2 wu4routine/ everyday business/ daily operation (of a company) 时常* 6 shi2 chang2often/ frequently 异常* 6 yi4 chang2exceptional/ abnormal/ an anomaly 家常* 6 jia1 chang2the daily life of a family 反常* 6 fan3 chang2unusual/ abnormal
KOREAN6000 word(s):
7 KOREAN 2500 New HSK words):
非常 + fēicháng 대단히. 매우. 심히. 아주. daedanhi. maeu. simhi. aju.
常识 + chángshí 상식. 일반 지식. sangsig. ilban jisig.
平常 + píngcháng 평소. 평시. 평상시. 보통 때. pyeongso. pyeongsi. pyeongsangsi. botong ttae.
日常 + rìcháng 일상의. 평소의. 일상적인. ilsang-ui. pyeongsoui. ilsangjeog-in.
通常 + tōngcháng 평상시. 보통. 통상. pyeongsangsi. botong. tongsang.
照常 + zhàocháng 평소대로 하다. 평소와 같다. pyeongsodaelo hada. pyeongsowa gatda.
正常 + zhèngcháng 정상적인. jeongsangjeog-in.
8 KOREAN Sentence(s):
非常感谢！ + 정말 고맙습니다. cheongmal komapteumnida.
您经常旅行(出差)吗? + 여행을 많이 해요? yeohaengeul manhi haeyo?
您经常到这里来吗？ + 여기 자주 와요? yeo-gi chaju wahyo?
我经常头痛。 + 머리가 자주 아파요. meori-ga chaju apayo.
血压是正常的。 + 혈압은 정상이에요. hyeo-rabeun jeongsangiyeyo.
您经常向老师提问吗？ + 선생님께 자주 질문해요? seonsaeng-nimkke chaju jilmunhaeyo?
不，我不经常问他。 + 아니요, 자주 질문 안 해요. aniyo, chaju jilmun an haeyo.
我以前经常问问题。 + 저는 항상 물어봤어요. jeoneun hangsang mu-reobwah-sseoyo.