Remove "Price". Remove button and price on Category pages

I've built a custom template and have made many of the changes I needed. Here are the items I'm still struggling to modify:

1. Remove the word "Price" from category page and from product page. This site is for an artist and it needs to look more like a gallery page.

2. On the category page, where I have thumbnail images, remove the buy button and price, leaving only the product title. The price and purchase button needs to display ONLY on the Product page.

Thank you.