which day of the week

to express, to say in words, to put into words

to show, to make apparent / to express, to put into words / to signify, to represent, to symbolize, to stand for

day of the week

(adverbial particle, dismissive, derogatory) emphasizes disgust, contempt, or otherwise negative feelings of the speaker: whatever

What? What did you say?

whatchamacallit, X

nothing

what number, how many (used with a counter) / (used with も) many (used with a counter)

What?, Huh?