v. 1
To cultivate or persistently entertain (an attitude, usually negative) in one's mind; to brood or obsess over.
v. 2
To breastfeed: to feed (a baby) at the breast; to suckle.
She believes that nursing her baby will make him strong and healthy.
v. 3
To breastfeed: to be fed at the breast.
n. 1
A person involved in providing direct care for the sick: Anyone performing this role, regardless of training or profession.
My aunt was my nurse while I recuperated at home from surgery.

Related words

Word family: nurselike nursely nursemaid nursling
Phrases: grey nurse shark charge nurse instrument nurse scrub nurse wet nurse grey nurse nurse's we

Forms

Plural: nurses → nannies, nursemaids…
Past participle: nursed
e.g. nursed → suckled, breast-fed, lactated, sucked…

or Nurse?

To nurse is to tend the helpless or feeble, as infants, or the sick or wounded.

J. C. Fernald, English Synonyms and Antonyms (1914)

Use in printed books, per decade from 1850 to 2019.

3 letters: sip¹
4 letters: hold¹, bear¹, feed¹, tend¹, suck¹, rear¹
5 letters: train¹, raise¹, nanny²
6 letters: attend², foster², harbor², foment², suckle², coddle²
7 letters: husband², promote², harbour², cherish², nurture², nourish², lactate²
9 letters: entertain³, nursemaid

The small number after each word is its number of syllables (nanny² = 2 syllables).