However, you can create words with related meanings by using prefixes and suffixes:
Prefixes:
* Sub- itself is a prefix meaning "under" or "beneath," which is already present in "subdue."
* Over- could be used to create "oversubdue," implying excessive subduing.
* Re- could be used to create "resubdue," implying subduing again.
Suffixes:
* -ment could be used to create "subduement," which is a noun meaning the act of subduing.
* -er could be used to create "subduer," which is a noun meaning someone who subdues.
While these words might not be in common usage, they demonstrate how you can manipulate "subdue" with prefixes and suffixes to create words with related meanings.