den

As an initialism dtn is

.

As a noun dex is

(physics|and|astrophysics) an order or factor of ten used both to refer to the function $\backslash mathrm\{dex\}(x)\; =\; 10^x$ and the number of (possibly fractional) orders of magnitude separating two numbers when dealing with log to the base 10 transform of a number set the transform of 10, 100, and 1 000 000 is $\backslash log\_\{10\}(10)\; =\; 1$, $\backslash log\_\{10\}(100)\; =\; 2$, and $\backslash log\_\{10\}(1\; 000\; 000)\; =\; 6$, so the difference between 10 and 100 in base 10 is 1 dex and the difference between 1 and 1 000 000 is 6 dex or dex can be (informal) dextromethorphan or dex can be (gaming) dexterity.

As a noun deni is

denial.

As a noun zen is

(religion) a denomination of buddhism.

As an adjective zen is

(religion) pertaining to this denomination of buddhism.

As a preposition nen is

under.

As an abbreviation dec is

diethylcarbamazine.

As nouns the difference between den and dene

is that den is a small cavern or hollow place in the side of a hill, or among rocks; especially, a cave used by a wild animal for shelter or concealment while dene is a valley, especially the deep valley of a stream or rivulet.

As proper nouns the difference between den and dene

is that den is a diminutive of the male given name Dennis while Dene is an Athabascan people of Canada, especially of the Northwest Territories and Nunavut.

As a verb den

is to ensconce or hide oneself in (or as in) a den.

As an abbreviation den

is abbreviation of lang=en (a unit of weight.

As a noun gen is

chin.

As a proper noun deb is

abbreviated form of the female given name deborah.