I was looking for improvements on my vocabulary and then I saw the word
telephone which accordinly to Genki series is でんわ, but let's suppose that I want to say
This telephone is white, is gramatically correct to say このでんわはしろです.
Can I say both は and わ? Sounding something like
kono denwa wa shiro desu? Or should I choose another word (if there is one) to replace でんわ to not mess up the noun with the particle?