What is the word 'welcome' when translated from English to Japanese?

"Okaeri" means "Welcome home"

"Irasshai" means "Welcome" (as in welcome to my home/store)

"Dou itashimashite" means "You're welcome" (as in answering thank you)

ようこそ "Yōkoso" means "Welcome" (as in greeting)

if you want a more formal approach, extend it to irasshaimase