I’ll just copy-paste my long list of word middles! Hopefully most of these will apply. They’re categorized by number of syllables for ease in combo-making, but ignore that
4+: Alstroemeria, Chrysanthemum, Camellia, Constellation, Dandelion, Magnolia, Serenity, Waterlily
3: Allium, Amity, Apricot, Amaranth, Bellflower, Butterfly, Bumblebee, Bravery, Beloved, Clemency, Clementine, Chamomile, Daffodil, Dahlia, Daylily, Edelweiss, Firefly, Hummingbird, Honeysuckle, Honeycomb, Honeydew, Holiday, Juniper, Lavender, Ladybug, Lilypad, Midsummer, Marigold, Mimosa, Marjoram, Nightingale, October, Peregrin(e), Poésie, Rosemary, Seawillow, Sunflower, Tangerine, Wildflower, Wanderer
2: Autumn, Blanchefleur, Bluejay, Bluebell, Bluebird, Blackbird, Blossom, Briar, Bunny, Clover, Cricket, Daphne, Daisy, Darling, Easter, Foxglove, Feather, Fauna, Heather, Hopestill, Harvest, Honey, Honor, Hazel, Iris, Joyspring, July, Lovelace, Loveday, Linden, Lyric, Lilac, Meadow, Merry, Opal, Otter, Olive, Ocean, Primrose, Penrose, Promise, Prairie, Posie, Petal, Pipkin, Poppy, Poet, Poem, Rosefinch, Rejoice, Rowan, Rosie, Rabbit, Sundance, Sunday, Sunshine, Solstice, Saffron, Sparrow, Summer, Tuesday, Tulip, Wednesday, Wilder, Willow, Winter
1: Bliss, Bird, Bee, Bloom, Brave, Clove, Cloud, Dream, Day, Dove, Fox, Finch, Fawn, Fern, Fable, Fleur, Gray, Lake, Lamb, Lark, Love, Moon, Maple, March, Owl, Ocean, Plum, Poet, Peace, Rain, Rue, Sprout, Sable, Snow, Swan, Sun, True, Thistle, Wilde, Wren, Lou, Rose