Breakfast conversation

Me: You know last night we were having a fascinating conversation about favourite words?

Secondspawn: Yes?

Me: So what’s your favourite word?

Ss: Lava!

Me: Lava? why?

Ss: Because it’s only got four letters and it sounds like it’s got more.

Me: ??

Ss: It’s spelt L-A-A-V, you see, which is only four letters, but it sounds like it’s spelt L-R-A-V-E-R which is seven letters.

Me: … aaah.