Should I report this for not accepting "bath" as labra? In my daily life I only ever say "bath" to mean "bathtub", and I think that's common enough where I'm from.
I think you issue here is that 'labra' is plural. So 'bathtubs', 'baths', and 'tubs' all have a case for being accepted, but not their singular forms.
Doesn't Labrum mean lip?
Yes labrum means lip and lābrum means tub. But since the course currently doesn't use macrons they would both look the same.
Um is there a difference between "Bathtub" and "tub" because I put "tub" and I got it wrong.
"You can fill my pipe and then go fetch my slippers, then boil me up another cup of tea. Then put another log on the fire, baby, and come and tell me why you're leaving me!"