From Longman Dictionary of Contemporary Englishpeanutpea‧nut /ˈpiːnʌt/ ●●● S3 noun 1 
[countable]DFF a pale brown nut in a thin shell which grows under the ground SYN groundnut a packet of roasted peanuts2 → peanuts
[countable]DFF a pale brown nut in a thin shell which grows under the ground SYN groundnut a packet of roasted peanuts2 → peanutsExamples from the Corpus
peanut• The whole business seemed to have shrunk in importance to the size of a peanut anyway.• Remove from heat and beat in sugars, syrup, eggs, milk and peanuts.• Savoy Crunch peanuts are coated in a crispy shell in smoked bacon or sweet and sour flavours.• salted peanuts• The peanut program allows only farmers with a federal quota to grow peanuts for the domestic market.• He noticed, as she sliced the bread and spread it clumsily with peanut butter, that her hands were shaking. 