noun
Common loanword for a person traveling for leisure; often used in travel industry contexts.
夏になると多くのツーリストがこの町を訪れる。
Many tourists visit this town in summer.
ツーリスト向けのガイドブックを買った。
I bought a guidebook for tourists.
観光客 is the more common native Japanese term for 'tourist' or 'sightseer'; ツーリスト is a loanword with a slightly more international or travel-industry feel.
Borrowed from English 'tourist'.