​THEIR/THERE/THEY’RE
“Their” shows possession, while “there” is a place, and “they’re” is a contraction of “they are.”
They’re heading over to their house, which is over there
ADVISE/ADVICE
ADVISE verb
ADVICE noun.
Both words have the same meaning, but their parts of speech differ as shown above .However suffice it to say that advise(verb) is whatsomebodydoes, while advice(noun) is whatsomebodygives.
NOTE: advice(noun) should never be pluralized...