φθορά, -ᾶς, ἡ (< φθείρω) [in LXX for שַׁחַת, חֶבֶל, etc. ;] destruction, corruption, decay (see Mayor on 2Pe, App.,175 ff.): Refs Rom.8:21, 1Co.15:42, Col.2:22, 2Pe.2:12; opp. to ζωὴ αἰώνιος, Gal.6:8; by meton., of that which is subject to corruption, 1Co.15:50; of moral decay, Refs 2Pe.1:4 2:12 2:19 (cf. Wis.14:12).† (AS)
Thayer:
1) corruption, destruction, perishing 1a) that which is subject to corruption, what is perishable 1b) in the Christian sense, eternal misery in hell 2) in the NT, in an ethical sense, corruption i.e. moral decay
φθορά
phthora
fthor-ah'
From G5351; decay, that is, ruin (spontaneous or inflicted, literally or figuratively)
φθείρω
phtheirō
fthi'-ro
Probably strengthened from φθίω phthiō (to pine or waste): properly to shrivel or wither, that is, to spoil (by any process) or (genitive) to ruin (especially figuratively by moral influences, to deprave)
KJV Usage: corrupt (self), defile, destroy.
G862 ἄφθαρτοςἄφθαρτος
aphthartos
af'-thar-tos
From G1 (as a negative particle) and a derivative of G5351; undecaying (in essence or continuance)
KJV Usage: not (in-, un-) corruptible, immortal.
G1311 διαφθείρωδιαφθείρω
diaphtheirō
dee-af-thi'-ro
From G1223 and G5351; to rotthoroughly, that is, (by implication) to ruin (passively decay utterly, figuratively pervert)
KJV Usage: corrupt, destroy, perish.
G2704 καταφθείρωκαταφθείρω
kataphtheirō
kat-af-thi'-ro
From G2596 and G5351; to spoilentirely, that is, (literally) to destroy; or (figuratively) to deprave
KJV Usage: corrupt, utterly perish.
G5349 φθαρτόςφθαρτός
phthartos
fthar-tos'
From G5351; decayed, that is, (by implication) perishable
KJV Usage: corruptible.
G5352 φθινοπωρινόςφθινοπωρινός
phthinopōrinos
fthin-op-o-ree-nos'
From a derivative of φθίνω phthinō (to wane; akin to the base of G5351) and G3703 (meaning lateautumn) autumnal (as stripped of leaves)
KJV Usage: whose fruit withereth.
G5355 φθόνοςφθόνος
phthonos
fthon'-os
Probably akin to the base of G5351; illwill (as detraction), that is, jealousy (spite)