What is a Bumpy 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.

If a word has a certain property, I call it a Bumpy Word™.
You can use the examples below to find the property:

Bumpy™
Not Bumpy™

ARMY
NAVY

BUMPING
JERKING

CABAL
CONSPIRACY

CHASER
PURSUER

COALESCE
SOLIDIFY

COMPOSITE
DIVERSE

CRANK
TURN

CRAZY
INSANE

EXAMINATION
TEST

FERAL
UNCIVILIZED

HIGHER
GREATER

JUMPING
LEAPING

ORATOR
SPEAKER

QUALITATIVE
SUBJECTIVE

SQUASH
CRUSH

THRASH
SPASM

TRUSTING
BELIEVING

UPWARD
SKYBOUND

VAULTING
CAVERNOUS

WELDED
FUSED

Here is a CSV version:
Bumpy™,Not Bumpy™
ARMY,NAVY
BUMPING,JERKING
CABAL,CONSPIRACY
CHASER,PURSUER
COALESCE,SOLIDIFY
COMPOSITE,DIVERSE
CRANK,TURN
CRAZY,INSANE
EXAMINATION,TEST
FERAL,UNCIVILIZED
HIGHER,GREATER
JUMPING,LEAPING
ORATOR,SPEAKER
QUALITATIVE,SUBJECTIVE
SQUASH,CRUSH
THRASH,SPASM
TRUSTING,BELIEVING
UPWARD,SKYBOUND
VAULTING,CAVERNOUS
WELDED,FUSED

Ankoganit · Accepted Answer

In a word,

Then a Bumpy word is

Example:

Why "Bumpy"?

What is a Bumpy Word™?

One Answer

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Bumpy™	Not Bumpy™
ARMY	NAVY
BUMPING	JERKING
CABAL	CONSPIRACY
CHASER	PURSUER
COALESCE	SOLIDIFY
COMPOSITE	DIVERSE
CRANK	TURN
CRAZY	INSANE
EXAMINATION	TEST
FERAL	UNCIVILIZED
HIGHER	GREATER
JUMPING	LEAPING
ORATOR	SPEAKER
QUALITATIVE	SUBJECTIVE
SQUASH	CRUSH
THRASH	SPASM
TRUSTING	BELIEVING
UPWARD	SKYBOUND
VAULTING	CAVERNOUS
WELDED	FUSED