The word "furniture" is a noncount noun that refers to tables, chairs, couches, dressers, desks, beds, etcetera. Because "furniture" is a noncount noun, it’s always singular.
- There is a lot of furniture in Tom’s house.
- How much furniture is in your house?
- Sarah needs to move some furniture inside her apartment.
- When we need to get new furniture, we go to a furniture store.
- Ikea is a popular place to buy new furniture.
- Many Americans like antique furniture.
- We bought a nice piece of furniture from an antique dealer. He sold us a 200-year-old desk.
He hurt his back while trying to move some furniture.
The word "furnish" is a verb. To furnish is to provide something, whether its furniture or something else.
- Charles and Camille furnished their apartment with things they found at a resale store.
- The house we visited last weekend was very nicely furnished. (This sentence is in the passive voice.)
- The hotel furnishes its guests with everything that they need for a relaxing stay.