Some antonyms would be: Decline, cessation, or halting.
"Initial" and "final" are antonyms. "Initial" refers to something that occurs at the beginning or the start of a process, while "final" pertains to the end or conclusion of that process. Thus, they represent opposite points in a sequence or timeline.
http://thesaurus.reference.com/browse/process?qsrc=2890 has a list of synonyms and antonyms
Antonyms
antonyms
What are the antonyms for cavernous
what isbrief of antonyms
antonyms
Thick and slender are antonyms, words with opposite meanings.
antonyms
antonyms
yes antonyms are opposite
Antonyms for "die" include:live