swordtail swordtail /ˈsɔrdteɪl/

noun

1. Freshwater fish of Central America having a long swordlike tail; popular aquarium fish  ( helleri , swordtail , topminnow , Xyphophorus helleri )
   freshwater fish of Central America having a long swordlike tail; popular aquarium fish
   
   

 progymnosperm progymnosperm /proʊˈdʒɪmnoʊˌspɜːrm/

noun

1. An ancestral fossil type from which modern gymnosperms are thought to have derived  ( progymnosperm )
   an ancestral fossil type from which modern gymnosperms are thought to have derived
    Scientists have discovered fossils of progymnosperms that offer insights into the evolution of modern gymnosperms.
   Scientists have discovered fossils of progymnosperms that offer insights into the evolution of modern gymnosperms.
   
   

 ocean ocean /ˈoʊʃən/

noun

1. () A large body of water constituting a principal part of the hydrosphere  ( ocean )
   a large body of water constituting a principal part of the hydrosphere
    The ocean is a vast body of saltwater that covers most of the Earth's surface
   The ocean is a vast body of saltwater that covers most of the Earth's surface
   
   
2. Anything apparently limitless in quantity or volume  ( ocean , sea )
   anything apparently limitless in quantity or volume
   

 in-fighting in-fighting /ˈɪnˌfaɪtɪŋ/

noun

1. () Conflict between members of the same organization (usually concealed from outsiders)  ( in-fighting )
   conflict between members of the same organization (usually concealed from outsiders)
   
2. Boxing at close quarters  ( in-fighting )
   boxing at close quarters
    The boxing match was intense, with a lot of in-fighting between the two opponents.
   The boxing match was intense, with a lot of in-fighting between the two opponents.