How do these elements bond? (covalent/ionic)?

In cl we did a lab with Sulfur Hydroxide and Phosphorus Hydroxide, and he told us to find what they're commonly known as..I tried to figure out their chemical formula and I realized that they can't bond since both OH (hydroxyl) and P and S are negative ions! would that mean that they are covalently bonded, and called phosphorus hydroxide, or hydroxyl phosphate, or something?!?! Can someone tel me how they are bonded, and if possible what they're names and formulas are? THANK YOU!!