Though 'spherical' suggests a perfect sphere, objects described as such may not be flawless. Despite being called a spherical bubble, slight irregularities can still be seen.
Pro Tip 2/3
Volume Implication
Describing something as spherical often implies it has volume, not just a circular outline. A basketball is a spherical object, not a flat circle.
Pro Tip 3/3
General Likeness
Spherical can mean generally round without being a mathematically precise sphere. We often call a round cake a spherical dessert.