IPA: /ˈwɛlkəmər/
KK: /ˈwɛlkəmər/
A person who greets and receives others, especially those who are new or unfamiliar.
The welcomer at the event made everyone feel at home.
Welcomer → It is formed from "welcome" (from Old English *wilcuma*, meaning a person who is pleasing or agreeable) and "-er" (meaning a person who). A welcomer is a person who provides a pleasing or agreeable reception.
Think of someone who is 'pleasing' ('wilcuma') to others — that's why a welcomer is someone who makes others feel welcome.