What is the difference between a hat and a cap?

Help me fix a stupid argument, but I had warmed up this weekend. (And no for the first time, actually.) are "hat" and "cap" synonyms, are covers of a certain type of hat or are two distinct, different types of head wear?

A cap fits over the head and is made of soft material. It has a wing, although it can have a viewfinder, like a baseball cap. There are also the caps worn by the Jewish faith and the pope. One always has a wide-brimmed hat and is shaped in different ways, but not "embrace" the shape of his head a cap made. It is usually made of a stronger material and usually used outdoors for protection from the elements.

Stripe Crochet Beanie Cap Hat

Cap Washer $4.99 Now it’s easier than ever to clean soiled baseball caps; just toss them in the washing machine. This handy Cap Washer protects your hat in the washing machine and holds its shape so your baseball hat comes out looking like new. Perfect for use on ball caps visors and wool caps. The Baseball Cap Washer features durable plastic construction that stands up to wash after wash. The specially designed…

CapRack 36 (Black) (60 H x 4 W x 4.5 D) $18.99 Display a total of 36 caps on this versatile over-the-door cap rack! The 5-foot cord allows multiple placement options, while the innovative clips can be spaced anywhere along the cord, for unlimited display options. This hat rack may be hung over a door, on a wall, looped over a closet rod, and even hung from the ceiling. Use it in the living room, bedroom, den, or garage – it’s also perfect f…

Cap Rack 18 System $12.95 …

Dane Cook Holiday Gift Set (3 DVDs and 1 Cd) w/ Bonus SuFi Knit Cap $44.80 3 discs and 1 CD – New packaging Vicious Circle – 1 90min concert and bonus material; Tourgasm – 9 half hour episodes and original bonus materials; Audio CD – 1 90 min concert – The only place Vicious Circle will be available on audio CD; SuFi knit cap…

Captains Boat Yachting Yacht Sailing Fishing Hat Cap $3.49 Captains Boat Yachting Yacht Sailing Fishing Hat Cap…

Adidas Men’s ‘Wounded Warrior Project*’ Baseball Cap $15.99 Keep the sun out of your eyes and off your head with a baseball capMen’s hat displays the ‘Wounded Warrior Project’ emblem All net proceeds from the sale of this product go directly to ‘Wounded Warrior Project.*’

Adi Designs Women’s Crochet Cap $18.99 Show of your unique style with a crochet cap from Adi Designs Women’s hat offers a soft and flexible brim Fashion accessory adds the perfect finishing touch to any outfit

Hailey Hats Military Caps with Embroidered Star $16.49 Get the latest in fashionable headwear wearing Hailey Hats Caps feature embroidered star design on one sideHats are made in military style design

Hat – Motorcycle biker Cap $12.95 HAT -

Hat – Captain / Yacht Cap $10.95 Your’e in charge of the ship in this authentic styled Captian’s cap.

DC – Cap Star Hat (Navy) – Hats $28 Zappos.com is proud to offer the DC – Cap Star Hat (Navy) – Hats: Wrap your dome in the DC Cap Star Hat. ; Stretch FlexFit design. ; DC logo embroidery at front. ; 100% cotton twill.

DC – Cap Star Hat (Grey) – Hats $30 Zappos.com is proud to offer the DC – Cap Star Hat (Grey) – Hats: Wrap your dome in the DC Cap Star Hat. ; Stretch FlexFit design. ; DC logo embroidery at front. ; 100% cotton twill.

DC – Cap Star Hat (Royal Blue) – Hats $30 Zappos.com is proud to offer the DC – Cap Star Hat (Royal Blue) – Hats: Wrap your dome in the DC Cap Star Hat. ; Stretch FlexFit design. ; DC logo embroidery at front. ; 100% cotton twill.