Yes, iron is a Scrabble word!

Verb

1. Press and smooth with a heated iron

Adjective

1. Extremely robust

Noun

1. A heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood

2. A golf club that has a relatively narrow metal head

3. Implement used to brand live stock

4. Home appliance consisting of a flat metal base that is heated and used to smooth cloth