As verbs the difference between decomposing and decaying
is that decomposing is present participle of lang=en while decaying is present participle of lang=en.
As a noun decaying is
the act of something that decays.
decaying
English
Verb
(head)
Noun
(
en noun)
The act of something that decays.
* 1839 , William Jenkyn, ?James Sherman, An Exposition Upon the Epistle of Jude (page 274)
- Spiritual witherings and decayings are opposite to the word of God.