Hexadecimal (“hex”) is a base-16, rather than the standard base-10, number system, usually using the characters “0”–“9” and “a”–“f” to represent values 0–15. Hexadecimal triplets are six-digit hex codes used to denote colors in several programming languages. For example, #000000 represents black, #ffffff represents white, and #8a35ef represents a blue violet. You can see examples of hex triplets and their colors using the color picker below. (JavaScript color picker by Taufik Nurrohman is released under the MIT License.)

This means that six-letter words made up of only the letters a through f represent colors in hex. Here are all 27 English words I could find that meet these criteria, along with definitions and the colors they represent in hex, all arranged into paint chips.

(Hex triplets aren’t always six digits—they can be abbreviated and/or support transparency—but that’s how I chose to limit my search. Definitions have been abbreivated from linked Wiktionary entries, which are released under the CC BY-SA 3.0 license. Retrieved 21 March 2021.)

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#faffed
verb
simple past tense and past participle of faff
to waste time on an unproductive activity.
[Wiktionary]
#efface
verb
to erase (as anything impressed or inscribed upon a surface); to render illegible or indiscernible.
[Wiktionary]
#deface
verb
to damage or vandalize something, especially a surface, in a visible or conspicuous manner.
[Wiktionary]
#baccae
noun
plural of bacca
berry.
[Wiktionary, Merriam-Webster]
#deeded
verb
simple past tense and past participle of deed
to transfer real property by deed.
[Wiktionary]
#daffed
verb
simple past tense and past participle of daff
to be foolish; make sport; play; toy.
[Wiktionary]
#baffed
verb
simple past tense and past participle of baff
to hit or strike, especially with something flat or soft.
[Wiktionary]
#beefed
verb
simple past tense and past participle of beef
to complain.
[Wiktionary]
#bedded
verb
simple past tense and past participle of bed
to go to bed.
[Wiktionary]
#badded
verb
simple past tense and past participle of bad
to shell (a walnut).
[Wiktionary]
#accede
verb
to agree or assent to a proposal or a view; to give way.
[Wiktionary]
#dadded
verb
simple past tense and past participle of dad
to throw against something; to dash.
[Wiktionary]
#bedaff
verb
to befool; make a fool of.
[Wiktionary]
#acceed
verb
alternative spelling of accede
to agree or assent to a proposal or a view; to give way.
[Wiktionary, 2]
#decaff
noun
alternative spelling of decaf
a decaffeinated coffee, tea, or soft drink.
[Wiktionary, 2]
#cabbed
verb
simple past tense and past participle of cab
to travel by taxicab.
[Wiktionary]
#beaded
adjective
made from, or decorated with, beads.
[Wiktionary]
#babbed
verb
simple past tense and past participle of bab
to fish for eels using a bab.
[Wiktionary]
#dabbed
verb
simple past tense and past participle of dab
to press lightly in a repetitive motion with a soft object without rubbing.
[Wiktionary]
#deafed
verb
simple past tense and past participle of deaf
to deafen.
[Wiktionary]
#deaded
verb
simple past tense and past participle of dead
to prevent by disabling; stop.
[Wiktionary]
#deaced
adjective
abbreviated form of deceased
no longer alive; dead.
[Wiktionary, 2]
#feeded
verb
simple past tense and past participle of feed
to give (someone or something) food to eat.
[Wiktionary, 2]
#facade
noun
the face of a building, especially the front view or elevation.
[Wiktionary]
#fabbed
verb
simple past tense and past participle of fab
to fabricate, especially in the context of fabbers.
[Wiktionary]
#decede
verb
to withdraw.
[Wiktionary]
#decade
noun
a group, set, or series of ten, particularly a period of ten years.
[Wiktionary]

Finally, I summarized all the above paint chips in the form of pixel art, shown below.

A pixel art representation of the seven preceding paint chips