1) postage stamp: (post + -age) + stamp
2) post-office worker: (post + office) + (work + -er)
3) post-office savings bank: (post + office) + {[(save + -ing) + -s] + bank}
4) ex-boyfriend: ex- + (boy + friend)
5) schoolmasterly: (school + master) + -ly
6) as-a-matter-of-factly: (as + a + matter + of + fact) + -ly
我們稱這類研究為詞匯形態學 (lexical morphology) 或構詞法 (word-formation)。