IPA: /rɪˈliːsər/
KK: /rɪˈliːsər/
A person or thing that causes something to be released or set free, often referring to a stimulus that triggers a specific response or behavior.
The releaser of the shipment ensured that all packages were sent on time.
Releaser → It is formed from "re-" (meaning again) and "leas" (from Old English *leasian*, meaning to let go or release) and "-er" (meaning a person who). The word "releaser" refers to a person who lets go or frees something again.
Think of someone who is 'letting go' ('leas') of something 'again' ('re-') — that's why a releaser is a person who frees or lets go.