Zombie Villager

Zombie Villager is a slightly stronger version of the regular Zombie. It has 20 more, Leather Armor, and runs at the same speed as Baby Zombies. Zombie Villagers only spawn at the Graveyard during night and have a higher spawn rate. This often creates clusters and can make it difficult to get past the Graveyard during night time. They drop Rotten Flesh which can be used to progress the Rotten Flesh Collection.

Strategy
Unless you are a new player, Zombie Villagers shouldn't be a trouble to bother you, but if they are, you should get yourself an Intimidation Talisman from Adventurer that costs, which will let this mob no longer target you. If you cannot get yourself this yet, then you should use a ranged weapon such as a Bow to attack, as they would still deal decent damage to you. You cannot outrun them with Base 100 (as they have  150), so be sure not to try that as it will end up getting even more Zombies and Zombie Villagers on you, and might lead to your death.

Trivia

 * When interacted with the Bartender, he will talk about Zombie Villagers.