Gematria Calculator › Atbash › לב קמי = כשדים
Lev Kamai = Kasdim: One Word Hidden in Two
הִנְנִי מֵעִיר עַל בָּבֶל וְאֶל יֹשְׁבֵי לֵב קָמָי רוּחַ מַשְׁחִית
Jeremiah 51:1
Letter by letter
ל↓כ
ב↓ש
ק↓ד
מ↓י
י↓מ
לב קמי ← כשדים (Atbash)
Sources
The Baraita of the 32 Rules (Rule 29, "Gematria") brings this verse as an example of letter exchange: Lev Kamai is Kasdim in Atbash.
Here one word – Kasdim – is hidden across two adjacent words. The site's search engine also searches such combinations of two or three adjacent words.
Rashi on Sukkah 28a brings this example as well.