Appendage and Additions

Appendage noun - Something that is not necessary in itself but adds to the convenience or performance of the main piece of equipment.

Additions and appendage are semantically related In some cases you can replace term "Additions" with "Appendage", this nouns are similar.

Nearby Words: append, appended, appending

Appendage and additions are semantically related in enlargement of something topic. You can use "Appendage" instead a noun "Additions".