In haste and Pell-mell

In haste adverb - In a hurried or hasty manner.

Pell-mell and in haste are semantically related. In some cases you can use "Pell-mell" instead an adverb phrase "In haste".

Pell-mell adverb - In a confused and reckless manner.

In haste and pell-mell are semantically related. Sometimes you can use "In haste" instead an adverb phrase "Pell-mell".