W3. welfare-W4. widespread

welfare

构词：wel（= well 好）＋fare（= fore, per, 向前走, 继续过）

好过 n. （社会）福利; adj. 福利的

相关：farewell（走好！） ; taxi / bus / train fare, fee

搭配：social / public / economic / child / the child’s welfare; provide / live on welfare; welfare system/ reform/ services/ payment 

近义：wellbeing, happiness, interest, benefit, support

widespread

构词：wide（宽广）＋spread（展开）

广泛展开 adj. 普遍的, 广泛的

相关：wide, widely, widen;  spread, spray, spring

搭配：widespread existence / acceptance / support / popularity / use / concern / damage / criticis

近义：wide, broad, common, general, popular, universal, epidemic, prevalent, pervasive, extensive, far-reaching

考点：普遍与特殊对立, 写作常用