What is a Flamenco Word™?

Question

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.

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If a word satisfies a certain property, it is called a Flamenco Word™. Find out what the rule is given the following examples.

Flamenco Words™	non-Flamenco Words™
Flamenco	Dancing
Iambic	Pentameter
Lemon	Zest
Preset	Format
Effigy	Statue
Mentor	Teacher
Kilt	Skirt
True	False
Leaf	Petal
Plum	Peach

And a CSV Version:

FLAMENCO, DANCING
IAMBIC, PENTAMETER
LEMON, ZEST
PRESET, FORMAT
EFFIGY, STATUE
MENTOR, TEACHER
KILT, SKIRT
TRUE, FALSE
LEAF, PETAL
PLUM, PEACH

Answer 1

A Flamenco word is one which satisfies the following rule

Either the letters in odd-numbered positions or those in even-numbered positions are alphabetically adjacent and ascending.

Examples

FLAMENCO -> _L_M_N_O
IAMBIC -> _A_B_C
EFFIGY -> E_F_G_
TRUE -> T_U_
LEMON -> L_M_N
PRESET -> _R_S_T

Answer 2

Too long for a comment. Following the logic of the answer given by @hexomino, I wrote a short script to find all flamenco words:

Using a word list of ~40k English words, I found 293 flamenco words in total (ignoring 2-letter words or 3-letter words that only use the center letter). Most of the words are of length 3 (21 words), 4 (125 words), and 5 (122 words). The words of length 6 and longer are as follows. Length 6: cadger, codger, cudgel, effigy, iambic, lament, lamina, lemony, manioc, mentor, minion, minnow, preset (13 words). Length 7: aliment, alimony, alumina, clement, element, fatback, flaming, leafage, payback, sawbuck (10 words). Length 8: flamenco, flamingo (2 words), tying for the title of longest flamenco word.

If we define a Doubly Flamenco Word to be one for which both the odd- and even-positioned letters are in ascending alphabetical order, the only Double Flamenco Word found was "lamb" ( _A_B and L_M_ )