This is the 8307th most frequent Portuguese word.
trem
Train.
Here, 'trem' refers to a means of transportation on rails, specifically a train.
O trem chegou na estação às oito horas.
The train arrived at the station at eight o'clock.
In this sentence, 'trem' colloquially refers to a set of objects or stuff.
Minha irmã tem um trem de panelas em casa.
My sister has a bunch of pots at home.
The word 'trem' is used informally to mean 'thing' or 'stuff', referring to something not specifically identified.