The List
There are 97 7 letter words with W as the last letter. The highest scoring is JACKDAW at 24 points in Scrabble. 36 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
AIRCREWAIRFLOWAIRGLOWAIRSHOWBACKSAWBANDSAWBESHREWBESTREWBESTROWBOURLAWBUCKSAWCATCLAWCATSPAWCHOCTAWCONCREWCORNROWCUMSHAWDANELAWDAYGLOWDEWCLAWDISAVOWDOWNBOWEYEBROWFITCHEWFLAMFEWFLYBLEWFLYBLOWFOREPAWFORESAWFORSLOWFRETSAWGORCROWHACKSAWHANDSAWHOOSGOWINSINEWJACKDAWKILLCOWKNOWHOWLADYCOWLOCKJAWLONGBOWLOWBROWMISDRAWMISDREWMISGREWMISGROWMISKNEWMISKNOWMISTBOWMOONBOWMORPHEWMUDFLOWMUDSCOWOUTCROWOUTDRAWOUTDREWOUTFLEWOUTFLOWOUTGLOWOUTGNAWOUTGREWOUTGROWOVERNEWOVERSAWOVERSEWOVERSOWPICKMAWPILCROWPOURSEWPRESHOWPREVIEWPURVIEWRAINBOWREENDOWRIKSHAWRINGTAWSALCHOWSEMIRAWSHALLOWSHARROWSOMEHOWSPARROWSUNGLOWSURVIEWSWALLOWTRISHAWUNIBROWUNSCREWUNSINEWUPTHREWUPTHROWWHIPSAWWHITLOWWHITTAWWINDROWWINGBOW