Flat
Flat noun - A room or set of rooms in a private house or a block used as a separate dwelling place.
Straight line and flat are semantically related in right topic. In some cases you can use "Straight line" instead a noun "Flat".
Straight line
Straight line noun - A line traced by a point traveling in a constant direction; a line of zero curvature.
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Synonyms for Straight line
Flat and straight line are semantically related in right topic. Sometimes you can use "Flat" instead a noun phrase "Straight line".
Both terms in one sentence
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They explode much faster than grenades and airstrikes, but travel in a straight line, so you either have to be on flat terrain or have the definite high ground.
Source: Video Game / Darwinia - When the Brains go on a rampage in Futurama, Hermes points to each destroyed planet on a flat star map and notes that each planet forms a straight line that points directly toward the Earth; precisely the planet that the Brains attack next.
Source: Sacrificial Planet
Cite this Source
Straight line and Flat. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/flat/straight_line
Flat & Straight line. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/flat/straight_line>.
Straight line or Flat. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/flat/straight_line.
Google Ngram Viewer shows how "flat" and "straight line" have occurred on timeline