Words in the words "Memorial Day":

Moral, year, lord, road, deal, memory, lame, dimmer, mole, moe, demo, real, lair, liar, year, dare, Mary, memo, mild, mold, model, oreo, meal, lid, lad, mom, yam, may/May, rim, rial, made, lamely, yearly, early, airy, dimly, dam, mad, madly, daily, day, rid, mile, moldy, rod, lay, led.

Words in the word "Birthday": (Not counting birth and day)

had, bird, I, a, ay, third, tab, rib, hit, hat, dab, hay, ray, bay, at, dirt, dirty, ad, rid.

Christmas Words:

Christ, am, sit, sat, ma, chat, hat, sir, ham, mit, mat, mist, hi, at, as, rim, hit, has, tar, sits, chats, hats, mits, mats, hits, rims, his.

Halloween words: (words in the word Halloween.)

                                                38 words so far
There's: halo, when, new, wee, we, low, all, law, hall, hello, heal, hen, hell, no, lawn, now, won, lean, an, a, whale, lane, wall, well, woe, ale, haw, how, hallo, hole, lea, hew, allow, wheel, heel, eel, he, wen.