Dear & Deer

With an A – precious, sentimental, beloved.
With two Es – Bambi, Rudolph, House Baratheon.

C, Sea, See

Humerus & Humorous

"Why did I laugh when you broke your arm? Because it was humerus!"
This is one of my all-time favorite homophones. Can't believe it took me so long to get to it.

Choral & Coral

With an H – referring to a choir.
Without an H – a type of marine invertebrate.