Hi-ya is an attention-grabbing word that is usually used as a greeting or salutation. However, if you're looking for other alternatives for this word, there are various synonyms you can use to spice up your conversation. For instance, you can greet someone with 'Hello,' 'Hi,' 'Hey,' or 'Howdy.' If you want a more casual tone, 'Yo,' 'Sup,' and 'Wassup' are suitable alternatives. Additionally, 'Greetings,' 'Salutations,' 'Good Day,' and 'Welcome' are appropriate for formal settings. Lastly, 'Cheers,' 'Hail,' and 'Hola' are great options that you can use to greet someone in a fun and unique way.