What is another word for invulnerability?

It depends which invulnerability you mean. In the sense “having the strength to withstand attack”, the synonyms are impregnability. Across all 2 senses there are 1 distinct synonyms, and they are not interchangeable with each other — this page lists them under the sense each one belongs to.

What is the opposite of invulnerability?

The recorded antonym is vulnerability. Opposites are sense-specific too: this page shows which meaning each one is the opposite of, because a word rarely has a single opposite that holds for all of its senses.

Why are the synonyms for invulnerability split into groups?

Because invulnerability carries 2 recorded senses and each has its own set of substitutes. A single flat list would put words from unrelated meanings side by side with nothing to tell them apart, which is exactly how a writer picks the wrong one. The grouping comes from WordNet's synsets, not from an editorial judgement of ours.

Where do the synonyms for invulnerability come from?

From Princeton University's WordNet, a lexical database maintained by lexicographers since 1985. A synonym here means a word form that shares a synset with this word — a set of forms interchangeable in one recorded context. Nothing on this page is generated by a language model.

Synonyms and antonyms

invulnerability

invulnerability/ˌɪnˌvʌlnɚəˈbɪlɪti/

nounRare

invulnerability has 1 distinct synonym spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is vulnerability.

1
Distinct synonym: 1
Antonym: 2 of 2
Senses with a relation

Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.