Note: these 'words' (valid or invalid) are all the permutations of the word hat. These words are obtained by scrambling the letters in hat.
Definitions and meaning of hat
(UK, US) IPA(key): /hæt/
(Canada, California, Received Pronunciation) IPA(key): [hat]
(Northern US) IPA(key): [hɛt]
From Middle Englishhat, from Old Englishhæt(“head-covering, hat”), from Proto-Germanic*hattuz(“hat”), from Proto-Indo-European*kadʰ-(“to guard, cover, care for, protect”). Cognate with North Frisianhat(“hat”), Danishhat(“hat”), Swedishhatt(“hat”), Icelandichattur(“hat”), Latincassis(“helmet”), Lithuaniankudas(“bird's crest or tuft”), Avestan𐬑𐬀𐬊𐬛𐬀 (xaoda, “hat”), Persianخود (xud, “helmet”), Welshcaddu(“to provide for, ensure”). Compare also hood.
A covering for the head, often in the approximate form of a cone or a cylinder closed at its top end, and sometimes having a brim and other decoration.
There was a neat hat-and-umbrella stand, and the stranger's weary feet fell soft on a good, serviceable dark-red drugget, which matched in colour the flock-paper on the walls.
(figurative) A particular role or capacity that a person might fill.
1993, Susan Loesser, A Most Remarkable Fella: Frank Loesser and the Guys and Dolls in His Life: A Portrait by His Daughter, Hal Leonard Corporation (2000), →ISBN, p.121:
My mother was wearing several hats in the early fifties: hostess, scout, wife, and mother.
(figurative) Any receptacle from which numbers/names are pulled out in a lottery.
(figurative, by extension) The lottery or draw itself.
(video games) A hat switch.
2002, Ernest Pazera, Focus on SDL, p.139:
The third type of function allows you to check on the state of the joystick's buttons, axes, hats, and balls.
(typography, nonstandard, rare) The háček symbol.
1997 October 6th, “Patricia V. Lehman” (user name), rec.antiques (Usenet newsgroup), “Re: Unusual Mark – made in Cechoslovakia”, Message ID: <[email protected]>#1/1
I’lll have to leave it up to antiques experts to tell you when objects were marked that way, but I can tell you it’s called a “hacek” (with the hat over the “c” and pronounced “hacheck”.) It is used to show that a “c” is pronounced as “ch” and an “s” as “sh.” Sometimes linguists just call it the “hat.”
(programming, informal) The caret symbol ^.
(Internet slang) User rights on a website, such as the right to edit pages others cannot.
(Cambridge University slang, obsolete) A student who is also the son of a nobleman (and so allowed to wear a hat instead of a mortarboard).
(student and nobleman):gold hatband, tuft
See also Thesaurus:headgear
Sranan Tongo: ati
take one's hat off to
hat (third-person singular simple presenthats, present participlehatting, simple past and past participlehatted)
(transitive) To place a hat on.
(transitive) To appoint as cardinal.
1929, "Five New Hats," Time, 2 December, 1929, 
It was truly a breathtaking rise. From the quiet school, Pope Pius XI had jumped Father Verdier over the heads of innumerable Bishops, made him Archbishop of Paris. Soon he was to be hatted a Prince of the Church and put in charge of the Cathedral of Notre-Dame.
(Scotland, Northern England or obsolete)simple past tense of hit
From Proto-Germanic*haitaz. Cognate with Old Frisianhēt (West Frisianhjit), Old Saxonhēt, Dutchheet, Old High Germanheiz (Germanheiß), Old Norseheitr (Swedishhet). Cognate to Albanianethe(“shiver, fiever”), dialectal hethe and ith(“warmth, body heat”), dialectal hith.