The word "up bear" is a compound word made up of two separate words - "up" and "bear". The stress falls on the first syllable of "up", which is pronounced as "ʌp", and the second syllable of "bear", which is pronounced as "bɛər". When put together, it is pronounced as "ʌp bɛər". The spelling of this word follows standard English spelling rules where "up" is spelled as it sounds, and "bear" is spelled with the silent "e" indicating the long vowel sound.