Here's why:
* Homograph: Words that are spelled the same but have different meanings and pronunciations.
* Homophone: Words that sound the same but have different spellings and meanings.
"Sow" can be pronounced two ways:
1. Sow (rhymes with "cow") - Meaning: to plant seeds in the ground.
2. Sow (rhymes with "how") - Meaning: a female pig.
Since "sow" has different pronunciations depending on its meaning, it's a homograph.