Across

  1. Ghost - A ghost is a "see-through spirit" that’s often associated with haunted houses. It fits the 5-letter requirement.

  2. Trick or Treat - On Halloween, people dress up in costumes and go "trick-or-treating," which matches the 5-2-5 letter format.

  3. Skeleton - Skeletons are often associated with Halloween, and they can make rattling noises when they walk. This fits the 8-letter requirement.

  4. Cauldron - Witches are known for using cauldrons to make potions, and it’s an 8-letter word.

  5. Werewolf - Werewolves are creatures associated with Halloween that howl at the full moon. This answer has 8 letters.

Down

  1. October - Halloween occurs in October, which is 7 letters long.

  2. Pumpkin - Pumpkins are carved and decorated for Halloween. This 7-letter word matches the clue.

  3. Witch - Witches wear pointed hats and often ride broomsticks, fitting this 5-letter clue.

  4. Frog - Frogs are green and can be found in ponds. This matches the 4-letter requirement.

  5. Vampire - Vampires are creatures in Halloween lore that "suck blood." This word has 7 letters.

  6. Bat - Bats are winged creatures that often come out at night. This answer has 3 letters.

  7. Boo - "Boo" is a common word people say to scare others, especially during Halloween. This fits the 3-letter clue.