Both pyridine and pyrrole are aromatic; however, pyridine is a modest base while pyrrole is not. This is because the lone pair of electrons on nitrogen (N) in pyridine does not engage with the remaining pi bonds, whereas the lone pair of electrons on nitrogen (N) in pyrrole also does not engage with the remaining pi bonds. Additionally, pi bonds add electron density towards the nitrogen atom in pyridine, while pi bonds add electron density towards nitrogen (N) in pyrrole.