Yes, dinnertime is a compound word.
Dinnertime - 2009 was released on: USA: 19 June 2009 (internet)
The cast of Dinnertime - 2010 includes: Ishaan Kumar as Father
until dinnertime
time-table, time-out, part-time, all-time, etc. bedtime daytime dinnertime downtime halftime lunchtime mealtime nighttime noontime overtime sometime springtime summertime suppertime timekeeper timepiece timeshare wintertime
Dinnertime - 2000 was released on: USA: 11 November 2000 (Rosebud Film Festival)
No, building is not a compound word.
The contraction (not a compound word) is doesn't.
Upwards is a compound word.
There is no compound word.A compound word is a word like bus-stop.Husban is spelt like this husband
Upstairs is a compound word, so it is one word.
Mango is not a compound word.
It cannot be a compound word.