Flood plain or floodplain?
flood plain is a noun meaning “Alternative form of floodplain”; floodplain is a noun meaning “A low-lying plain adjacent to a river subject to flooding during periods of…”. flood plain is written as two words and floodplain as one word; they are used differently.
What is the difference between flood plain and floodplain?
| flood plain | floodplain | |
|---|---|---|
| Part of speech | noun | noun |
| Meaning | Alternative form of floodplain | A low-lying plain adjacent to a river subject to flooding during periods of high rainfall or at high tide |
| Example | none recorded | Near-synonyms: bottomland, bottomlands |
| Forms | none | floodplains |
| Pronunciation | not recorded | /ˈflʌdˌpleɪn/ |
| In writing | not counted (the list counts single words) | about once in every 2 million words |
Sources: flood plain and floodplain in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of flood plain and floodplain
flood plain
- 1
Alternative form of floodplain
floodplain
- 1
A low-lying plain adjacent to a river subject to flooding during periods of high rainfall or at high tide
Near-synonyms: bottomland, bottomlands
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, flood plain or floodplain?
flood plain is a phrase, which the list of single words does not count; floodplain about once in every 2 million words.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How many people search flood plain vs floodplain?
“flood plain vs floodplain” is searched about 10 times a month on Bing (Google reports it together with close variants, so it has no figure of its own) in the United States.
Sources: Google Ads keyword data through DataForSEO and Microsoft Advertising keyword data through DataForSEO, the average month from September 2025 to August 2026.