The word for ‘watch’ in Spanish is ‘reloj’.
In Spanish, ‘reloj’ is a masculine noun, so when using it in a sentence, you would say ‘el reloj’ to mean ‘the watch’. For example, ‘Tengo un reloj nuevo’ translates to ‘I have a new watch’. It’s also important to note that ‘reloj’ can refer to clocks in general, so context matters when using the word.