This list ended up longer than I suspected, and there are many many more words that are obscure or scientific or variations on the words below.
Here are the 39 words I came up with that contain the letters NDR, in that order, with no intervening letters: android, androgen, androgynous, cylindrical, dandruff, dendrite, downdraft, (entendre… not sure if this one counts, because it’s French), foundry, fundraiser, handrail, hindrance, hundred, husbandry, hypochondria, indri (a lemur, and a “crossword puzzle word”), kindred, laundry, mandrake, mandrill, mitochondria, rhododendron, pachysandra, palindrome, panjandrum (what a great word), polyandry, raindrop, scoundrel, spindrift, splendor, sundrops (a plant), sundry, syndrome, tendril, tundra, undramatic, undrinkable, undress (and a few more un-words that are less interesting), windrow, and wondrous.
Have a wondrous rest of the week.