The Spanish word 'cicuta' comes directly from the Latin word 'cicuta', which referred to the hemlock plant. This is a straightforward inheritance where both the form and meaning have remained essentially unchanged from Latin to modern Spanish. Hemlock is notably infamous as the poisonous plant used in the execution of Socrates in ancient Greece.

There aren't many common Spanish words that are etymologically related to 'cicuta', as it's a fairly specific botanical term that has maintained its original form and meaning.

While English doesn't have any common words directly related to 'cicuta', the scientific name for water hemlock is 'Cicuta', which was taken from the Latin word. This term appears in scientific and botanical contexts in English.