Answer: cos

AnswerCrossword Clue
COSComic Bill, briefly
COSBusiness orgs.
COSFortune 500 listings: Abbr.
COSNASDAQ listings
COSNYSE listings
COSFunny Bill, familiarly
COSFunny Bill's nickname
COSComedian Bill, briefly
COSComedian Bill, to friends
COS... Cob, Connecticut
COSFunnyman Bill, familiarly
COSTrig. ratio
COSTrigonometry abbr.
COSFirms (abbr.)
COSFirms, for short
COSInc. listings
COSTrig. calculation
COSFortune-reading focus, briefly
COSSin-tan
COS"I Spy" star, to fans
coscounties
COSCalculator-key abbr.
COSFunnyman Bill, briefly
COSAdj-hyp
COSLettuce variety
COSRomaine lettuce
COSComic Bill
COSSec's reciprocal
COSCorps.
COSArmy VIPs
COSBoot camp VIPs
COSBeloved comic's nickname
COSKin of sin and tan
COSRomaine
COSTrig. function
COSCalculator button
COSPublishing gps., e.g.
COSTrig function
COSComedian Bill, informally
COSOrgs.