• Alternative Forms: Abbreviations and their expansions — the same word said at a different length (e.g., "TV" ↔ "television", "thousand" ↔ "one thousand")
• Synonyms: Different words with similar meanings (e.g., "street" ↔ "road", "mad" ↔ "angry", "big" ↔ "large")
• Spelling Variants: The same word spelled differently (e.g., "gray" ↔ "grey", "donut" ↔ "doughnut"). These carry a full paradigm of their own and live in the Spelling Variants card below, not here.

The same word written differently — "gray" ↔ "grey", "doughnut" ↔ "donut". Each variant carries its own full set of forms ("grey" → "greyer", "greyest"), which is why it is listed separately from both synonyms (different words) and inflections (different forms of this spelling).