1, meaning different.
When angle is used as a noun, it has the meaning of (mathematics) angle and angle; Angels are angels, angelic people and so on.
2. Different parts of speech
Angle can be used as verbs, such as: fishing, forming (or bending) an angle, putting ... at an angle, adjusting (or aiming at) an angle, doing (news, report, etc. ) tendentiousness, etc. Angel is just a noun.
3. An angel can be a person's name
For example: Daniel? Is it? Meeting? His? Twins Sister? Angel. For what? Answer? Birthday Lunch. Daniel is having lunch with his twin sister Angel to celebrate his birthday.
References:
Baidu Encyclopedia _ Angle
Baidu Encyclopedia _ Angel