Related by context. Frequent words. (Click for all words.) 62 blowholes 59 mouthparts 57 stomata 55 hollow tubes 54 sinus cavities 54 tiny pores 54 pores 54 nasal cavities 53 sweat glands 53 capillaries 53 alveoli 53 tubules 52 Ultraviolet light 52 bronchi 52 pharynx 52 orifices 51 secretions 51 mandibles 51 airlocks 51 nasal passages 51 sensory organs 51 bronchial tubes 50 filamentous 50 air sacs 50 epididymis 50 mucous membrane 50 pharyngeal 50 bacterial spores 50 digestive juices 50 maxillary 50 potassium ions 50 umbilicus 50 motile 49 nasal passage 49 sebaceous glands 49 nostrils 49 setae 49 whiteheads 49 peritoneal cavity 49 vaginal secretions 48 conjunctiva 48 footpads 48 airtight seal 48 oral mucosa 48 outermost layer 48 lymph vessels 48 female reproductive tract 48 mucosa 48 membranes 48 bird beak 48 anatomical structures 47 collagen fibers 47 chloride ions 47 vents 47 cavity 47 abdomens 47 windpipes 47 vacuoles 47 planktonic 47 surgical incisions 47 phloem 47 exhalation 47 ultraviolet UV light 47 cranial nerves 47 cell membranes 47 ear canals 47 upper airway 47 nasal secretions 47 laminar 47 mucous membranes 47 crosslinking 47 gill 47 nasal cavity 47 glands 46 hermetically 46 digestive organs 46 inert gases 46 carpenter bees 46 dentin 46 mycelium 46 bacterial colonies 46 electrical conduction 46 lymphatic vessels 46 larval stage 46 soft tissues 46 chimney flue 46 crevices 46 ducts 46 droplets 46 tracheal 46 reversibly 46 cavities 46 sensory nerves 46 snail shells 45 microchannels 45 microscopic cracks 45 membrane 45 exhalations 45 sphincter 45 Dust mites 45 vagina