While there was a general "Apollo" program, the specific spacecraft itself was also called "Apollo". It's like saying "Ford" for a car.

However, there were different modules within the Apollo spacecraft:

* Command Module: This was the part that housed the astronauts during launch, reentry, and landing.

* Service Module: This was attached to the Command Module and provided propulsion, electricity, and other support systems.

* Lunar Module: This was used to land on the Moon and return to lunar orbit.

So, when referring to the specific vehicle, you'd say "Apollo spacecraft". When referring to a specific module, you'd say "Apollo Command Module", "Apollo Service Module", or "Apollo Lunar Module".