Classification – Odd one out (synonyms vs antonyms): Identify the pair unlike the others: Seldom : often, Good : Nice, Honest : Cheat, Extravagant : Thifty.

Introduction / Context:
Word-pair classification commonly distinguishes synonyms from antonyms. Three pairs here are opposites (antonyms), while one pair consists of near-synonyms, providing an unambiguous odd one out despite minor spelling issues (e.g., “Thifty” for “Thrifty”).

Given Data / Assumptions:

• Seldom : often → antonyms (rarely vs frequently).
• Good : Nice → near-synonyms (positive quality, agreeable/pleasant).
• Honest : Cheat → antonymic relationship by virtue of cheat as dishonest person/action.
• Extravagant : Thifty → intended antonyms (extravagant vs thrifty).

Concept / Approach:
Tag each pair as synonym or antonym. Identify the lone synonym pair among antonyms.

Step-by-Step Solution:
Seldom : often → antonyms.Honest : Cheat → antonyms by moral opposition.Extravagant : Thifty → antonyms (intended “thrifty”).Good : Nice → synonyms/near-synonyms.

Verification / Alternative check:
Even if one argues about degrees of synonymy for “good” and “nice,” they are aligned in positivity and usage far more than they are opposites, preserving uniqueness.

Why Other Options Are Wrong:

• Seldom:often, Honest:cheat, Extravagant:thrifty are all opposite in meaning.

Common Pitfalls:
Insisting on exact morphological matches (adjective-adjective); semantic polarity is what matters.

Final Answer:
Good : Nice