Grammatical terms

[08012006]

What are the names of the grammatical terms for
• words that are spelt the same but pronounced differently: eg row (as in boat) and row (as in noise or argument); bow (as in violin) and bow (as in curtsey)
• words that are spelt differently, but are pronounced the same: eg rain, reign; witch, which
• words that are spelt and pronounced the same, but have completely different meanings: eg seal (animal) seal (of approval)

Thanks

[Jumbuck]

1 homograph
2 homophone
3 homonym

[08012006]

I'm grateful for your help