The job is underway or ongoing?
Can I use the both phrases below in a business letter?
Are the words "job" and "works" interchangeable here: can I say "the job is ongoing" or "the works are underway"?

The works are ongoing.
The job is underway.

Question

The job is underway or ongoing?
Can I use the both phrases below in a business letter? 
Are the words "job" and "works" interchangeable here: can I say "the job is ongoing" or "the works are underway"?

The works are ongoing.
The job is underway.

Answer

'Underway' tells us that the project has started; 'ongoing' tells us that it hasn't finished yet.

I wouldn't use the plural 'works' unless you're talking about construction and repairs.  'Work' would be preferable.

Answer

Need more context, but to be safe, I think it would be more safer to say the job is underway.

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!