Possibilities:
Tie rod ends
Ball joints
Shocks
Control arm bushings
All the above
OR
Maybe it just needs an alignment
Have the alignment checked at a local automotive shop.
More than narrow tread tires.
When the tread (the pattern in the tyre) is wearing thin. In Britain the law says the tread must have a depth of at least 2mm. Other countries may have different legislation.
Minimum tread depth for all 4 tires is 2/32"
60% tread wear.
Many tires have tread wear indicator bars molded into the tread. When the tread is worn down to where you can see a solid bar of rubber across the width of the tread, it is time to replace the tire.
A good test is to take a penny and place it in the tread grove with the head of Lincoln facing down. If you can see the top of Lincoln's head you need new tires. If the tread is worn more on the inside or outside you need a front end alignment. If the tread is worn on the outer edges you are running the tires with too low air pressure. Worn in the center, too much air pressure. Of course dry rotted and cracked tires need replacing no matter the tread depth.
There are steel and fabric belts woven inside the casing and tread. These make the tire stiffer and hold traction better.
I assume you are referring to the tread. High grip will have a more aggressive tread design used in off-road conditions or in deep snow. They are called off-road tires or snow tires. The difference is in the tread design.
While it is good to use tires with the same tread and sizes, it is possible to use tires with different tread patterns, though you should be careful as the performance of the two tires may be different, causing your car to be unbalanced, endangering your passengers.
Because they have more tread.
Only aggressive tread new tires whine.