Good egg and Sweetheart

Good egg noun - (old-fashioned slang) a good person.

Sweetheart and good egg are semantically related. in good person topic. In some cases you can use "Sweetheart" instead the phrase "Good egg" as a noun or an adjective.

Sweetheart adjective - Privileged treatment of a favored person or corporation (sometimes unethically).

Good egg and sweetheart are semantically related. You can use "Good egg" instead an adjective "Sweetheart".