suithlas
This is simply imported Goldogrin suithlas (GL:68). In Goldogrin, it is formed as a compound of suith 'drink, draught' and lass 'leaf'. It can be still interpreted this way in Sindarin: In the Etymologies, one has SUK- 'drink', Noldorin sûth 'draught', but later Sindarin shows again a vocalization to ui in nuitha- (RUK-, WJ:413), gruitha- (GRUK-, WJ:415).
G. suithlas 'tea' (GL:68)
Anírog ylf suithlas? Do you want a cup of tea?