late 14c. lauier, lawer, lawere (mid-14c. as a surname), "one versed in law, one whose profession is suits in court or client advice on legal rights," from Middle English lawe "law" (see law) + -iere. Spelling with -y- predominated from 17c. (see -yer). In the New Testament (Luke xiv.3, etc.) "interpreter of Mosaic law." Old English had lahwita, with wita "sage, wise man; adviser councilor," and an earlier Middle English word for "lawyer" was man-of-law (mid-14c.). Related: Lawyerly.
"Public agitation for greater safety and higher quality in consumer goods" [OED], 1969, in reference to the concerns and methods of U.S. lawyer and consumer advocate Ralph Nader (b. 1934) + -ism.
mid-13c. sawer, sauere, "one whose occupation is the sawing of timber into planks, boards, etc." (as a surname from c. 1200), agent noun from saw (v.). Altered to the modern form after late 13c. by French and French-derived words in -ier (such as lawyer, bowyer, clothier).
mid-13c., counseiler, "one who gives counsel or advice, a confidante," from Old French conseillier "counselor, adviser" (Modern French conseiller), from Latin consilator, agent noun from consiliare, from consilium (see counsel (v.)).
Also sometimes counsellor, but the double -l- is unetymological and perhaps is modeled on chancellor. Meaning "one who gives professional legal advice, a counseling lawyer," is from 1530s. Psychological sense (as in marriage counselor, is from 1940).