IPA: /ˈfeɪsˌʌp/
KK: /ˈfeɪsˌʌp/
In a position where the front or upper side is facing upward.
He placed the cards faceup on the table so everyone could see them.
The word 'faceup' is formed from 'face' (from Old French *face*, meaning the front or surface of something) and 'up' (meaning in a higher position or direction). The term 'faceup' describes the position of something that is oriented with its front side facing upwards.
Think of the 'face' as the front side of an object and 'up' indicating its position — so 'faceup' means the front side is facing upwards.
No commonly confused words.